body,html {
  line-height: 1;
  font-weight: 200;
  font-family: 'PingFang SC','STHeitiSC-Light','Helvetica-Light',arial,sans-serif;
}
.clearfix {
  display: inline-block;
  &:after {
    display: block;
    content: '';
    height: 0;
    line-height: 0;
    clear: both;
    visibility: hidden;
  }
}